Dayron Burney-Thorn is accused of shooting and killing 14-year-old Nicolas Elizalde and injuring four others in Philadelphia.
The other suspects in this case include Yaaseen Bivins, Saleem Miller, Troy Fletcher, and Zyhied Jones.
The shooting happened on September 27, 2022, after a football scrimmage at the high school.
Prosecutors say ultimately, the homicide trial will have all five defendants tried together.